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A new Marti 20 watt transmitter/receiver system would run around $3,600. For $2600 you can get a rebuilt used Marti pair, see here: http://www.rpu-stl.com/srs_003.htm. The older Marti STL-10's are common on the used market--the above site is a good place to go to get them rebuilt inexpensively. The STL-10's are generally very reliable once rebuilt.

Allow about $1,600 for a pair of antennas (e.g. miniflector receive, Marti 4' on transmit), plus cable for another $1,000, and you can have a complete system for around $5~6 K. Don't know what you are paying for the ISDN, but suspect the system would pay for itself very quickly.

By the way, if you want to see what will work, despite terrain--put in the following coordinates & elevations for an AM station's path into the terrain profile program:

This station was using an FM subcarrier to feed what then became the second hop STL from the receive location down to the AM site in the valley. Substantial improvement in audio quality and reliability.

I know this is an old thread. But isn't that the wrong antenna for use on the 950 STL band? Maybe just a typo as the part numbers are similar, PR-450 vs PR-950. Just hate seeing incorrect info that someone may use to make an expensive mistake.